What is the threshold for normal PSA levels in adults?

The threshold for normal prostate-specific antigen (PSA) levels in adults is generally considered to be 4 ng/ml or less. This value is used as a reference point when screening for prostate cancer and evaluating prostate health. PSA is a protein produced by the prostate gland, and elevated levels can indicate various conditions, including benign prostatic hyperplasia (BPH), prostatitis, or prostate cancer.

While the 4 ng/ml threshold is widely accepted, it is essential to remember that normal PSA levels can vary depending on factors such as age and race. For example, some guidelines suggest that the threshold may be adjusted for older men or those with specific risk factors. However, the 4 ng/ml benchmark remains the most commonly referenced figure in clinical practice for defining normal PSA levels.

An understanding of these thresholds is critical for healthcare providers in making informed decisions about further diagnostics or treatments based on PSA test results.